<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 警告区 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>

      <!-- 选择商品分类区 -->
    <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
            <!-- options 指定数据源  props 用来指定配置对象 v-model将选中的值绑定到input 必须是数组-->
            <el-cascader
                v-model="selectedCateKeys"
                :options="catelist"
                expandTrigger="hover"
                :props="cateProps"
                @change="handleChange"
                >
            </el-cascader>
        </el-col>
    </el-row>

      <!-- tab页签区 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数 -->
        <el-tab-pane label="动态参数" name="many">
            <el-button :disabled="selectedCateKeys.length !== 3 ? true : false"
             size="mini" type="primary" @click="addDialogVisible = true"
             >添加参数</el-button>
            <!-- 动态参数的表格 -->
            <el-table :data="manyTableData" border stripe>
              <el-table-column type="expand">
                <template slot-scope="scope">
                    <!-- 循环渲染tag标签 -->
                    <el-tag class="tag" v-for="(item, i) in scope.row.attr_vals"
                     :key="i" closable @close="handleClose(i,scope.row)">
                        {{item}}
                    </el-tag>
                    <!-- 输入文本框 -->
                    <el-input class="input-new-tag"  v-if="scope.row.inputVisible"
                     v-model="scope.row.inputValue"
                    ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)" >
                    </el-input>
                    <!-- 添加的按钮 -->
                    <el-button v-else class="button-new-tag" size="small"
                     @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" 
                    size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                    <el-button @click="removeParams(scope.row.attr_id)" type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
        </el-tab-pane>
        <!-- 添加静态属性 -->
        <el-tab-pane label="静态属性" name="only">
            <el-button :disabled="selectedCateKeys.length !== 3 ? true : false"
             size="mini" type="primary"  @click="addDialogVisible = true"
             >添加属性</el-button>
            <!-- 静态属性的表格 -->
            <el-table :data="onlyTableData" border stripe>
              <el-table-column type="expand">
                <template slot-scope="scope">
                    <el-tag class="tag" v-for="(item, i) in scope.row.attr_vals" :key="i"
                     closable @close="handleClose(i,scope.row)">
                        {{item}}
                    </el-tag>
                    <!-- 输入文本框 -->
                    <el-input class="input-new-tag"  v-if="scope.row.inputVisible"
                     v-model="scope.row.inputValue"
                    ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)" >
                    </el-input>
                    <!-- 添加的按钮 -->
                    <el-button v-else class="button-new-tag" size="small"
                     @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit"
                     size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                    <el-button @click="removeParams(scope.row.attr_id)" type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
        </el-tab-pane>
    </el-tabs>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="`添加${titleText}`" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed" >
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px"
        >
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>

        <!-- 修改参数的对话框 -->
    <el-dialog :title="`修改${titleText}`" :visible.sync="editDialogVisible"
     width="50%" @close="editDialogClosed" >
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px"
        >
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>

    </el-card>
  </div>
</template>

<script>
export default {
  data() {
        return {
            // 商品分类列表 
            catelist: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框的双向绑定的数组
            selectedCateKeys: [],
            // tab页签 被激活的页签的名称
            activeName: 'many',
            // 动态参数的数据
            manyTableData: [],
            // 静态属性的数据
            onlyTableData: [],
            // 控制添加参数、属性的对话框的显示与隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name:''
            },
            // 添加参数表单的验证规则对象
            addFormRules: {
                attr_name: [
                    {
                        required: true,
                        message: '请输入参数的名称',
                        trigger:'blur'
                    }
                ]
            },
            // 控制修改参数、属性的对话框的显示与隐藏
            editDialogVisible: false,
            // 修改参数的表单数据对象
            editForm: {},
            // 修改参数表单的验证规则对象
            editFormRules: {
                attr_name: [
                    {
                        required: true,
                        message: '请输入参数的名称',
                        trigger:'blur'
                    }
                ]
            }
            
    }
  },
    created() {
    this.getCateList()
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList() {
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200) {
                return this.$message.error('获取失败')
            }
            this.catelist = res.data
            // console.log(this.catelist);


        },
        //  级联选择框选中项变化会触发的函数
        handleChange() {
            this.getParamsData()
        },
        // 点击tab页签的处理函数
        handleTabClick() {
            this.getParamsData()
            // console.log(this.activeName);
        },
        // 获取参数的列表数据
        async getParamsData() {
            // console.log(this.selectedCateKeys);
            // 选中的不是三级分类
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 选中的是三级分类
            // 根据所选分类的ID 和当前所处的面板 获取对应的参数
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
                { params: {sel: this.activeName} })
            if (res.meta.status !== 200) {
                return this.$message.error('获取失败')
            }
            res.data.forEach(item => { 
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 添加控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框中输入的内容
                item.inputValue = ''
            })
            if (this.activeName === 'many') {
                this.manyTableData = res.data
            } else {
                this.onlyTableData = res.data
            }
            // console.log(res.data);
        },
        // 监听添加参数的对话框关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 点击确定 添加数据
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return
                const { data:res } = await this.$http.post(`categories/${this.cateId}/attributes`,
                    {
                        attr_name:this.addForm.attr_name,
                        attr_sel:this.activeName
                    })
                // console.log(res);
                if (res.meta.status !== 201) {
                    return this.$message.error('添加失败')
                }
                this.$message.success('添加成功')
                this.getParamsData()
                this.addDialogVisible = false
            })
        },
        // 点击编辑按钮 展示编辑对话框  
        async showEditDialog(attr_id) {
            // 查询当前参数的信息
            const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
                { params: { attr_sel: this.activeName } })
            if (res.meta.status !== 200) return
            this.editForm = res.data     
            this.editDialogVisible = true
        },
        // 监听修改参数的对话框关闭事件
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击确认修改参数  关闭修改对话框
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return 
                const { data:res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                    { attr_sel: this.activeName , attr_name: this.editForm.attr_name}
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('修改失败')
                }
                this.$message.success('修改成功')
                this.getParamsData()
                this.editDialogVisible = false
            }) 
        },
        // 删除参数
        removeParams(attr_id) {
            this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(async () => {
          const { data:res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
          if (res.meta.status !== 200) {
            return this.$message.error('删除失败')
              }
          this.getParamsData()  
          this.$message({
            type: 'success',
            message: '删除成功!'
          });
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除'
          });          
        });
        },
        // 文本框失去焦点或按下了enter触发的函数
        async handleInputConfirm(row) {
            if (row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return 
            }
            // 如果上面没有return 证明输入了内容 需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发请求保存这次 push 操作
            this.saveAttrVals(row)
        },
        // 将对 attr_vals 的操作保存到数据库
        async saveAttrVals(row) {
            const { data:res } = await this.$http.put(`categories/${this.cateId}/attributes/
            ${row.attr_id}`,
            {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
                })
            if (res.meta.status !== 200) {
                return this.$message.error('修改失败')
            }
            this.$message.success('修改成功')  
        },
        // 点击按钮 显示文本框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick：当页面上的元素被从新渲染之后，才会执行回调函数中的代码
            this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        // 删除对应的参数tag
        handleClose(i,row) {
            row.attr_vals.splice(i, 1)
            // 将对 attr_vals 的 splice 操作保存到数据库
            this.saveAttrVals(row)
        }
    },
    computed: {
        // 当前选中的三级分类的ID
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算添加参数的对话框的标题的文本
        titleText() {
            if (this.activeName === 'many') {
                return '动态参数'
            } else {
                return '静态属性'
            }
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.tag{
    margin:10px;
}

.input-new-tag{
    width: 120px;
}
</style>